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Commit 14e0e679 authored by Hiroshi DOYU's avatar Hiroshi DOYU Committed by Tony Lindgren
Browse files

OMAP: iommu: add initial debugfs support 



This enables to peek the following data.

$ /debug/iommu/isp# ls
mem             nr_tlb_entries  regs
mmap            pagetable       tlb
$ /debug/iommu/isp# head pagetable
L:      da:      pa:
-----------------------------------------
2: 00001000 8ae4a002
2: 00002000 8e7bb002
2: 00003000 8ae49002
2: 00004000 8ae65002
.....

Signed-off-by: default avatarHiroshi DOYU <Hiroshi.DOYU@nokia.com>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
parent 613f7769

arch/arm/mach-omap2/iommu2.c

+14 −5
Original line number Diff line number Diff line
@@ -217,10 +217,19 @@ static ssize_t omap2_dump_cr(struct iommu *obj, struct cr_regs *cr, char *buf) 
}



#define pr_reg(name)							\

	p += sprintf(p, "%20s: %08x\n",					\

		     __stringify(name), iommu_read_reg(obj, MMU_##name));



static ssize_t omap2_iommu_dump_ctx(struct iommu *obj, char *buf)

	do {								\

		ssize_t bytes;						\

		const char *str = "%20s: %08x\n";			\

		const int maxcol = 32;					\

		bytes = snprintf(p, maxcol, str, __stringify(name),	\

				 iommu_read_reg(obj, MMU_##name));	\

		p += bytes;						\

		len -= bytes;						\

		if (len < maxcol)					\

			goto out;					\

	} while (0)



static ssize_t omap2_iommu_dump_ctx(struct iommu *obj, char *buf, ssize_t len)

{

	char *p = buf;
@@ -242,7 +251,7 @@ static ssize_t omap2_iommu_dump_ctx(struct iommu *obj, char *buf) 
	pr_reg(READ_CAM);

	pr_reg(READ_RAM);

	pr_reg(EMU_FAULT_AD);



out:

	return p - buf;

}

arch/arm/plat-omap/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -120,6 +120,10 @@ config OMAP_MBOX_FWK 
config OMAP_IOMMU

	tristate



config OMAP_IOMMU_DEBUG

	depends on OMAP_IOMMU

	tristate



choice

        prompt "System timer"

	default OMAP_MPU_TIMER

arch/arm/plat-omap/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ obj-$(CONFIG_ARCH_OMAP16XX) += ocpi.o 


obj-$(CONFIG_OMAP_MCBSP) += mcbsp.o

obj-$(CONFIG_OMAP_IOMMU) += iommu.o iovmm.o

obj-$(CONFIG_OMAP_IOMMU_DEBUG) += iommu-debug.o



obj-$(CONFIG_CPU_FREQ) += cpu-omap.o

obj-$(CONFIG_OMAP_DM_TIMER) += dmtimer.o

arch/arm/plat-omap/include/mach/iommu.h

+3 −3
Original line number Diff line number Diff line
@@ -95,7 +95,7 @@ struct iommu_functions { 


	void (*save_ctx)(struct iommu *obj);

	void (*restore_ctx)(struct iommu *obj);

	ssize_t (*dump_ctx)(struct iommu *obj, char *buf);

	ssize_t (*dump_ctx)(struct iommu *obj, char *buf, ssize_t len);

};



struct iommu_platform_data {
@@ -162,7 +162,7 @@ extern void uninstall_iommu_arch(const struct iommu_functions *ops); 
extern int foreach_iommu_device(void *data,

				int (*fn)(struct device *, void *));



extern ssize_t iommu_dump_ctx(struct iommu *obj, char *buf);

extern size_t dump_tlb_entries(struct iommu *obj, char *buf);

extern ssize_t iommu_dump_ctx(struct iommu *obj, char *buf, ssize_t len);

extern size_t dump_tlb_entries(struct iommu *obj, char *buf, ssize_t len);



#endif /* __MACH_IOMMU_H */

arch/arm/plat-omap/iommu-debug.c

0 → 100644
+415 −0
Original line number Diff line number Diff line 
/*

 * omap iommu: debugfs interface

 *

 * Copyright (C) 2008-2009 Nokia Corporation

 *

 * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */



#include <linux/err.h>

#include <linux/clk.h>

#include <linux/io.h>

#include <linux/uaccess.h>

#include <linux/platform_device.h>

#include <linux/debugfs.h>



#include <mach/iommu.h>

#include <mach/iovmm.h>



#include "iopgtable.h"



#define MAXCOLUMN 100 /* for short messages */



static DEFINE_MUTEX(iommu_debug_lock);



static struct dentry *iommu_debug_root;



static ssize_t debug_read_ver(struct file *file, char __user *userbuf,

			      size_t count, loff_t *ppos)

{

	u32 ver = iommu_arch_version();

	char buf[MAXCOLUMN], *p = buf;



	p += sprintf(p, "H/W version: %d.%d\n", (ver >> 4) & 0xf , ver & 0xf);



	return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);

}



static ssize_t debug_read_regs(struct file *file, char __user *userbuf,

			       size_t count, loff_t *ppos)

{

	struct iommu *obj = file->private_data;

	char *p, *buf;

	ssize_t bytes;



	buf = kmalloc(count, GFP_KERNEL);

	if (!buf)

		return -ENOMEM;

	p = buf;



	mutex_lock(&iommu_debug_lock);



	bytes = iommu_dump_ctx(obj, p, count);

	bytes = simple_read_from_buffer(userbuf, count, ppos, buf, bytes);



	mutex_unlock(&iommu_debug_lock);

	kfree(buf);



	return bytes;

}



static ssize_t debug_read_tlb(struct file *file, char __user *userbuf,

			      size_t count, loff_t *ppos)

{

	struct iommu *obj = file->private_data;

	char *p, *buf;

	ssize_t bytes, rest;



	buf = kmalloc(count, GFP_KERNEL);

	if (!buf)

		return -ENOMEM;

	p = buf;



	mutex_lock(&iommu_debug_lock);



	p += sprintf(p, "%8s %8s\n", "cam:", "ram:");

	p += sprintf(p, "-----------------------------------------\n");

	rest = count - (p - buf);

	p += dump_tlb_entries(obj, p, rest);



	bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);



	mutex_unlock(&iommu_debug_lock);

	kfree(buf);



	return bytes;

}



static ssize_t debug_write_pagetable(struct file *file,

		     const char __user *userbuf, size_t count, loff_t *ppos)

{

	struct iotlb_entry e;

	struct cr_regs cr;

	int err;

	struct iommu *obj = file->private_data;

	char buf[MAXCOLUMN], *p = buf;



	count = min(count, sizeof(buf));



	mutex_lock(&iommu_debug_lock);

	if (copy_from_user(p, userbuf, count)) {

		mutex_unlock(&iommu_debug_lock);

		return -EFAULT;

	}



	sscanf(p, "%x %x", &cr.cam, &cr.ram);

	if (!cr.cam || !cr.ram) {

		mutex_unlock(&iommu_debug_lock);

		return -EINVAL;

	}



	iotlb_cr_to_e(&cr, &e);

	err = iopgtable_store_entry(obj, &e);

	if (err)

		dev_err(obj->dev, "%s: fail to store cr\n", __func__);



	mutex_unlock(&iommu_debug_lock);

	return count;

}



#define dump_ioptable_entry_one(lv, da, val)			\

	({							\

		int __err = 0;					\

		ssize_t bytes;					\

		const int maxcol = 22;				\

		const char *str = "%d: %08x %08x\n";		\

		bytes = snprintf(p, maxcol, str, lv, da, val);	\

		p += bytes;					\

		len -= bytes;					\

		if (len < maxcol)				\

			__err = -ENOMEM;			\

		__err;						\

	})



static ssize_t dump_ioptable(struct iommu *obj, char *buf, ssize_t len)

{

	int i;

	u32 *iopgd;

	char *p = buf;



	spin_lock(&obj->page_table_lock);



	iopgd = iopgd_offset(obj, 0);

	for (i = 0; i < PTRS_PER_IOPGD; i++, iopgd++) {

		int j, err;

		u32 *iopte;

		u32 da;



		if (!*iopgd)

			continue;



		if (!(*iopgd & IOPGD_TABLE)) {

			da = i << IOPGD_SHIFT;



			err = dump_ioptable_entry_one(1, da, *iopgd);

			if (err)

				goto out;

			continue;

		}



		iopte = iopte_offset(iopgd, 0);



		for (j = 0; j < PTRS_PER_IOPTE; j++, iopte++) {

			if (!*iopte)

				continue;



			da = (i << IOPGD_SHIFT) + (j << IOPTE_SHIFT);

			err = dump_ioptable_entry_one(2, da, *iopgd);

			if (err)

				goto out;

		}

	}

out:

	spin_unlock(&obj->page_table_lock);



	return p - buf;

}



static ssize_t debug_read_pagetable(struct file *file, char __user *userbuf,

				    size_t count, loff_t *ppos)

{

	struct iommu *obj = file->private_data;

	char *p, *buf;

	size_t bytes;



	buf = (char *)__get_free_page(GFP_KERNEL);

	if (!buf)

		return -ENOMEM;

	p = buf;



	p += sprintf(p, "L: %8s %8s\n", "da:", "pa:");

	p += sprintf(p, "-----------------------------------------\n");



	mutex_lock(&iommu_debug_lock);



	bytes = PAGE_SIZE - (p - buf);

	p += dump_ioptable(obj, p, bytes);



	bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);



	mutex_unlock(&iommu_debug_lock);

	free_page((unsigned long)buf);



	return bytes;

}



static ssize_t debug_read_mmap(struct file *file, char __user *userbuf,

			       size_t count, loff_t *ppos)

{

	struct iommu *obj = file->private_data;

	char *p, *buf;

	struct iovm_struct *tmp;

	int uninitialized_var(i);

	ssize_t bytes;



	buf = (char *)__get_free_page(GFP_KERNEL);

	if (!buf)

		return -ENOMEM;

	p = buf;



	p += sprintf(p, "%-3s %-8s %-8s %6s %8s\n",

		     "No", "start", "end", "size", "flags");

	p += sprintf(p, "-------------------------------------------------\n");



	mutex_lock(&iommu_debug_lock);



	list_for_each_entry(tmp, &obj->mmap, list) {

		size_t len;

		const char *str = "%3d %08x-%08x %6x %8x\n";

		const int maxcol = 39;



		len = tmp->da_end - tmp->da_start;

		p += snprintf(p, maxcol, str,

			      i, tmp->da_start, tmp->da_end, len, tmp->flags);



		if (PAGE_SIZE - (p - buf) < maxcol)

			break;

		i++;

	}



	bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);



	mutex_unlock(&iommu_debug_lock);

	free_page((unsigned long)buf);



	return bytes;

}



static ssize_t debug_read_mem(struct file *file, char __user *userbuf,

			      size_t count, loff_t *ppos)

{

	struct iommu *obj = file->private_data;

	char *p, *buf;

	struct iovm_struct *area;

	ssize_t bytes;



	count = min_t(ssize_t, count, PAGE_SIZE);



	buf = (char *)__get_free_page(GFP_KERNEL);

	if (!buf)

		return -ENOMEM;

	p = buf;



	mutex_lock(&iommu_debug_lock);



	area = find_iovm_area(obj, (u32)ppos);

	if (IS_ERR(area)) {

		bytes = -EINVAL;

		goto err_out;

	}

	memcpy(p, area->va, count);

	p += count;



	bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);

err_out:

	mutex_unlock(&iommu_debug_lock);

	free_page((unsigned long)buf);



	return bytes;

}



static ssize_t debug_write_mem(struct file *file, const char __user *userbuf,

			       size_t count, loff_t *ppos)

{

	struct iommu *obj = file->private_data;

	struct iovm_struct *area;

	char *p, *buf;



	count = min_t(size_t, count, PAGE_SIZE);



	buf = (char *)__get_free_page(GFP_KERNEL);

	if (!buf)

		return -ENOMEM;

	p = buf;



	mutex_lock(&iommu_debug_lock);



	if (copy_from_user(p, userbuf, count)) {

		count =  -EFAULT;

		goto err_out;

	}



	area = find_iovm_area(obj, (u32)ppos);

	if (IS_ERR(area)) {

		count = -EINVAL;

		goto err_out;

	}

	memcpy(area->va, p, count);

err_out:

	mutex_unlock(&iommu_debug_lock);

	free_page((unsigned long)buf);



	return count;

}



static int debug_open_generic(struct inode *inode, struct file *file)

{

	file->private_data = inode->i_private;

	return 0;

}



#define DEBUG_FOPS(name)						\

	static const struct file_operations debug_##name##_fops = {	\

		.open = debug_open_generic,				\

		.read = debug_read_##name,				\

		.write = debug_write_##name,				\

	};



#define DEBUG_FOPS_RO(name)						\

	static const struct file_operations debug_##name##_fops = {	\

		.open = debug_open_generic,				\

		.read = debug_read_##name,				\

	};



DEBUG_FOPS_RO(ver);

DEBUG_FOPS_RO(regs);

DEBUG_FOPS_RO(tlb);

DEBUG_FOPS(pagetable);

DEBUG_FOPS_RO(mmap);

DEBUG_FOPS(mem);



#define __DEBUG_ADD_FILE(attr, mode)					\

	{								\

		struct dentry *dent;					\

		dent = debugfs_create_file(#attr, mode, parent,		\

					   obj, &debug_##attr##_fops);	\

		if (!dent)						\

			return -ENOMEM;					\

	}



#define DEBUG_ADD_FILE(name) __DEBUG_ADD_FILE(name, 600)

#define DEBUG_ADD_FILE_RO(name) __DEBUG_ADD_FILE(name, 400)



static int iommu_debug_register(struct device *dev, void *data)

{

	struct platform_device *pdev = to_platform_device(dev);

	struct iommu *obj = platform_get_drvdata(pdev);

	struct dentry *d, *parent;



	if (!obj || !obj->dev)

		return -EINVAL;



	d = debugfs_create_dir(obj->name, iommu_debug_root);

	if (!d)

		return -ENOMEM;

	parent = d;



	d = debugfs_create_u8("nr_tlb_entries", 400, parent,

			      (u8 *)&obj->nr_tlb_entries);

	if (!d)

		return -ENOMEM;



	DEBUG_ADD_FILE_RO(ver);

	DEBUG_ADD_FILE_RO(regs);

	DEBUG_ADD_FILE_RO(tlb);

	DEBUG_ADD_FILE(pagetable);

	DEBUG_ADD_FILE_RO(mmap);

	DEBUG_ADD_FILE(mem);



	return 0;

}



static int __init iommu_debug_init(void)

{

	struct dentry *d;

	int err;



	d = debugfs_create_dir("iommu", NULL);

	if (!d)

		return -ENOMEM;

	iommu_debug_root = d;



	err = foreach_iommu_device(d, iommu_debug_register);

	if (err)

		goto err_out;

	return 0;



err_out:

	debugfs_remove_recursive(iommu_debug_root);

	return err;

}

module_init(iommu_debug_init)



static void __exit iommu_debugfs_exit(void)

{

	debugfs_remove_recursive(iommu_debug_root);

}

module_exit(iommu_debugfs_exit)



MODULE_DESCRIPTION("omap iommu: debugfs interface");

MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>");

MODULE_LICENSE("GPL v2");